Obsolete Libgcrypt Library

[Bolan]

The Linux binary distribution requires libgcrypt.so.11 for some functions, but, from summaries in a search on duckduckgo.com, that version has a security vulnerability, and the package providing it is no longer available from Debian or Ubuntu, though it is from 3rd party archives. The current version is libgcrypt.so.20. Please, edit Makefiles (or equivalent), after updating your build platform, accordingly.